Dissolved Oxygen and pH Modeling of a Periphyton Dominated, Nutrient Enriched River
Publication: Journal of Environmental Engineering
Volume 135, Issue 8
Abstract
Nutrient enrichment of the South Umpqua River, Oregon was linked to periphyton growth and large diel fluctuations in dissolved oxygen and hydrogen ion (pH) concentrations using the water quality model QUAL2Kw. The available data provide a good case study for the relatively new water quality model. QUAL2Kw simulates a dynamic diel heat budget and water quality kinetics for a one-dimensional, steady-flow system and is part of a family of models meant to serve as an update to the widely used QUAL2E. The model was used to quantify nonpoint source loading, determine the pollutant of concern, estimate natural conditions, and calculate a phosphorus total maximum daily load during summer, low-flow conditions. Control of both nonpoint and point sources is required to achieve the low instream phosphorus concentrations necessary to meet water quality criteria. To our knowledge, this is the first paper that reports on the application of a model for computing the maximum allowable load necessary to manage the diel variation in pH.
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Acknowledgments
Funding for part of this TMDL study was provided through a grant from UNSPECIFIEDEPA 319. The writers would like to thank Peter Leinenbach and Ben Cope of EPA and the Umpqua TMDL Technical Committee for review and suggestions. Special thanks go to Paul Heberling, Bobbi Lindberg, Dave Gilbey, and Larry Marxer of Oregon DEQ for data collection and environmental efforts throughout the basin. Much of the data used for this effort were collected by U.S. Geological Survey in cooperation with Douglas County.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 135 • Issue 8 • August 2009
Pages: 645 - 652
Copyright
© 2009 ASCE.
History
Received: Sep 13, 2006
Accepted: Mar 31, 2009
Published online: Jul 15, 2009
Published in print: Aug 2009
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